package com.qk.filter;

import com.qk.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取请求路径
        String uri = request.getRequestURI();
        //判断是否为登录请求 ,如果是, 放行
        if (uri.contains("/login")){
            log.info("登录请求: {}", uri);
            filterChain.doFilter(request, response);
            return;
        }
        //如果不是则获取请求头中的token
        String jwt = request.getHeader("token");
        //判断是否有token, 如果没有, 响应401错误
        if (jwt == null || jwt.isEmpty()){
            log.info("请求头中没有token");
            response.setStatus(401);
            return;
        }
        //如果有, 解析token, 若解析失败则响应401错误
        try{
            JwtUtils.parseToken(jwt);
        }
        catch (Exception e){
            log.info("解析token失败");
            response.setStatus(401);
            return;
        }
        //若解析成功则放行
        filterChain.doFilter(request, response);
    }
}
